Improvement in bolts for double doors



Elsf'LE.

Bolts for Double Doors.

Patented Sept. 29,1874.

l J r @messes r UNITED STATES PATENT OFFICE.

JOHN EISELE, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN BOLTS FOR DOUBLE DOORS.

Specification forming part of Letters Patent No. 155,507, datedSeptember 29, 1874; application led September 9, 1874.

' stand, make, and use the same, reference being had to the accompanyingdrawings makl ing part of this specilication, in which- Figure l is aface view of doors having my invention applied thereto. Figs. 2 and 3are end views of the doors. Fig. 4 is a vertical section in line a',Fig. 1. Fig. 5 is an enlarged view of a portion of the front of onedoor, and Fig. 6 is a similar view of the end of the other door.

Similar letters of reference indicate corre-` sponding parts in theseveral figures.

This invention relates to a inode of fastening double doors; andconsists in providing one door with sliding bolts having lateralextensions, and the other door with inclined ways, so that the closingof the latter door will serve to move the bolts of the other door tolocking positions.

Referring to the drawings, A represents two doors, which are hung asusually. To one door there are itted bolts B B, which, movingrespectively upwardly and downwardly, are designed to engage with theadjacent portions of the framefor locking` said door. The other doorwill be fastened by a lock, bolt, or latch, a, in any well-known manner.The bolts B are extended laterally, as at b, so as to project beyond theface of the inner end of the door to which they are tted, as seen inFig. 5, and on the projecting ends may be journaled rollers c, whichstand vertically. It is evident that when pressure is properly exertedon the ends b of the bolts the latter will be moved from their positionsand engage with the frame-work of the doors, as is well known, thereturn-motion of said bolts being accomplished by springs d, suitablyconnected to the bolts. On the inner face of the end of the other doorthere are secured ways C, which, extending transversely, andhavinginclined faces d', are arranged at or near the upper and lowerends of said door relatively to the location of the projecting ends b ofthe bolts B. The upper way has its inclined face on the upper' side, andthelowest point of said face is below. The lower way has its inclinedface on the lower side, and the highest point of said face is above.Spaces e c are formed in the door adjacent to the faces of the ways Cfor the passage of the ends b of the bolts B or rollers c thereon; butinclined grooves may be formedin said ways in lien of the spaces e.

The operation is as followszvThe door A', carrying the bolts B, isclosed on the frame, and the other door, A, brought up thereagainst. As.soon as the ways G reach the rollers c or ends b of the bolts, theinclined faces, having said rollers or ends bearing thereon, canse thebolts B to move out from their places of rest, and thus engage with theframe of the. doors. On fastening the other door, A, by means of thelock a, the two doors are securely held to the frame without liabilityof opening as long as the door A is locked to the door A. By operatingthe lock a and releasing the door A from door A', the ways C clear theends of the bolts or rollers thereon, whereby the bolts are free to movefrom the frame of the doors, and, owing to the action of the springs d,the disengagingl motions of the two bolts immediately occur, both doorsbeingthus unlocked or disconnected from each other and the frame.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is'- The sliding bolt-s B B, with lateralextensions b, with or without the rollers c, and the inclined ways C C,combined and operating substantially in the manner and for the purposeset forth.

JOHN EISELE.

Witnesses:

JOHN A. WIEDnRsHEIM, ALBERT H. HoEoKLEY.

